CN101674668A - Equipment and method for switching links between GPRS and CSD - Google Patents
Equipment and method for switching links between GPRS and CSD Download PDFInfo
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- CN101674668A CN101674668A CN200910018617A CN200910018617A CN101674668A CN 101674668 A CN101674668 A CN 101674668A CN 200910018617 A CN200910018617 A CN 200910018617A CN 200910018617 A CN200910018617 A CN 200910018617A CN 101674668 A CN101674668 A CN 101674668A
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Abstract
The invention discloses a method for controlling the link switching of data terminal equipment between GPRS and CSD in a wireless transmission system. The method comprises the following steps: when receiving terminal equipment needs link switching, judging whether GPRS of the receiving terminal equipment is in a connecting state or not, if so, disconnecting the connection of the GPRS and then revoking GPRS service; is not, directly revoking the GPRS service; delaying a period of time after the receiving terminal equipment revokes the GPRS services and then opening a CSD flow control; and finishing the switching of CSD mode by the receiving terminal equipment. Correspondingly, the invention also provides data terminal equipment suitable for the link switching between the GPRS and the CSD. The invention solves the problems that when network conditions are poor, the GPRS cannot be connected, short message delay time is long and the conventional instruction sending and triggering mode hasunreliability.
Description
Technical field
The present invention relates to the communications field, relate in particular to the data terminal equipment and the link switch-over method of link switchover between a kind of GPRS/CSD of being applicable to.
Background technology
GPRS (General Packet Radio Service, general packet radio service) data transmission unit (DTU, Data Terminal Unit) is widely used in the wireless transmitting system of the communications field, yet the GPRS link has the instability of connection, easily goes offline, when network condition is abominable even the problem that does not connect, system uses the mode that switches to CSD (Circuit Switch Data, circuit switched data services) to transmit and has guaranteed the reliability of communicating by letter at this moment.Because GPRS and CSD take same channel, the two can't use simultaneously, and a certain moment can only be used one of them, must carry out link switchover and just can use another way.When network condition was very poor, GPRS did not connect, and its short message delay is very big, and therefore traditional transmission instruction triggers mode is switched the very big problem of existence.
Summary of the invention
Embodiment of the invention technical problem to be solved is, the square law device that is used for control data terminal equipment GPRS/CSD handoff links in a kind of wireless transmitting system is provided.
In order to solve the problems of the technologies described above, the embodiment of the invention provides the method for control data terminal equipment GPRS/CSD handoff links in a kind of wireless transmitting system, comprise: when described receiving device needs link switchover, whether the GPRS that judges receiving device is in connection status, connect if just disconnect GPRS, cancel the GPRS service then; Otherwise, directly cancel the GPRS service; Described receiving device is opened the CSD Flow Control then cancelling GPRS service back time-delay a period of time, and described receiving device is accomplished to the switching of CSD pattern.
Correspondingly, the embodiment of the invention also provides the data terminal equipment of link switchover between a kind of GPRS/CSD of being applicable to, it is characterized in that, comprising:
Judge control unit, be used for when described receiving device needs link switchover, judge whether the GPRS of receiving device is in connection status, connect, cancel the GPRS service then if just disconnect GPRS; Otherwise, directly cancel the GPRS service;
Switch unit is used for time-delay a period of time after described receiving device is being cancelled the GPRS service, opens the CSD Flow Control, finishes the switching of described receiving device to the CSD pattern.
Implement the embodiment of the invention, can carry out link switchover between the GPRS/CSD, and avoided because network state is bad, and switching not smooth problem in the traditional transmission instruction triggers mode by data transmission unit DTU.
Description of drawings
Fig. 1 is that the present invention switches to CSD model process figure by GPRS;
Fig. 2 is that the present invention switches to GPRS model process figure by CSD;
Fig. 3 is the structure chart of data terminal equipment among the present invention.
Embodiment
The present invention is directed to above problem, proposed a kind of GPRS/CSD link automatic switching method based on DTU
Acquiescence connected GPRS when the transceive data terminal equipment started in the wireless transmitting system, and application CSD service but do not open the CSD Flow Control.But can carry out GPRS communication this moment between the terminal.
When GPRS did not connect, decision of receiving terminal data terminal equipment and control were switched, and switching has two kinds of situations: switch to CSD by GPRS, switch to GPRS by CSD.Be divided into two parts: receive and switch, send and switch; As shown in Figure 1, switch to CSD model process figure for the present invention by GPRS.
A.GPRS switches to CSD
(1) receive switching:
When transmission system need switch to the CSD mode and communicates by letter, receiving device was judged earlier whether the GPRS of receiving device is in and is connected the state of going up, and connects if just disconnect GPRS, cancels GPRS then and serves; Otherwise, directly cancel the GPRS service.After the GPRS oos service, the GRPS Flow Control has been closed naturally.For guaranteeing that the GPRS Flow Control closes successfully, receiving terminal was just opened the CSD Flow Control in several seconds cancelling GPRS service back time-delay, and so far receiving device switches to the CSD pattern and finishes.
(2) send switching:
When receiving device switches, receiving terminal DTU data call transmitting terminal DTU.After the event call-back function of transmitting terminal DTU by CSD captures the data call incident of receiving terminal DTU, check current transmission mode.If be the CSD pattern, just need not to switch; If the GPRS pattern just further judges whether GPRS connects, if on connecting, just close GPRS and connect, cancel the GPRS service, delay time then and opened the CSD Flow Control in several seconds, otherwise directly cancel GPRS service, delay time and opened the CSD Flow Control in several seconds, transmitting terminal switches to the CSD pattern and finishes at this moment.
As shown in Figure 2, switch to GPRS model process figure for the present invention by CSD.
B.CSD switches to GPRS
(1) receive switching:
When transmission system need switch to the GPRS pattern, receiving device was at first judged present mode, if when being the GPRS pattern, judged whether to connect, if just do not connect again; If when being the CSD pattern, just close the CSD Flow Control, in delay time again several seconds application GPRS service and the connection.
(2) send switching:
When receiving device switches, receiving terminal DTU audio call transmitting terminal DTU.After the event call-back function of transmitting terminal DTU by CSD captures the audio call incident of receiving terminal DTU, can check current transmission mode.If be the GPRS pattern, just further judge whether GPRS connects, if just do not connect on connecting; If when being the CSD pattern, just close the CSD Flow Control, in delay time again several seconds application GPRS service and the connection.
Correspondingly, the present invention also provides the data terminal equipment 30 of link switchover between a kind of GPRS/CSD of being applicable to, as shown in Figure 3, is the structure chart of data terminal equipment among the present invention, and wherein data terminal equipment comprises judgement control unit 301 and switch unit 302.
Judge that control unit 301 is used for when described receiving device needs link switchover, judge whether the GPRS of receiving device is in connection status, connect, cancel the GPRS service then if just disconnect GPRS; Otherwise, directly cancel the GPRS service;
Described data terminal equipment also comprises: second judging unit 303 is used to judge the link switchover that whether needs of receiving device.
Those skilled in the art can be understood that: described judgement control unit 301 and switch unit 302 have only been described in embodiments of the present invention by the situation of GPRS mode switch to the CSD pattern, but apparently, it also can realize not repeated them here by the situation of CSD mode switch to the GPRS pattern.
Above disclosed is a kind of preferred embodiment of the present invention only, can not limit the present invention's interest field certainly with this, and therefore the equivalent variations of doing according to claim of the present invention still belongs to the scope that the present invention is contained.
Claims (8)
1, the method for control data terminal equipment GPRS/CSD handoff links in a kind of wireless transmitting system comprises:
When described receiving device needs link switchover, judge whether the GPRS of receiving device is in connection status, connect if just disconnect GPRS, cancel the GPRS service then; Otherwise, directly cancel the GPRS service;
Described receiving device is opened the CSD Flow Control then cancelling GPRS service back time-delay a period of time, and described receiving device is accomplished to the switching of CSD pattern.
2, method according to claim 1 is characterized in that, the method for control data terminal equipment GPRS/CSD handoff links in the wireless transmitting system also comprises:
Judge the link switchover that whether needs of receiving device.
3, method according to claim 2 is characterized in that, the method for control data terminal equipment GPRS/CSD handoff links in the wireless transmitting system also comprises:
Described receiving device when switching, the data call sending ending equipment;
Sending ending equipment detects the data call incident of receiving device by CSD event call-back function, checks current transmission mode;
If be the CSD pattern, then need not to switch, if the GPRS pattern judges then whether GPRS is in connection status, connect if just disconnect GPRS, cancel the GPRS service then; Otherwise, directly cancel the GPRS service;
Described sending ending equipment is opened the CSD Flow Control then cancelling GPRS service back time-delay a period of time, and described sending ending equipment is accomplished to the switching of CSD pattern.
4, method according to claim 1 is characterized in that, wherein, described sending ending equipment and receiving device can be data transmission unit DTU.
5, a kind of data terminal equipment that is applicable to link switchover between the GPRS/CSD is characterized in that, comprising:
Judge control unit, be used for when described receiving device needs link switchover, judge whether the GPRS of receiving device is in connection status, connect, cancel the GPRS service then if just disconnect GPRS; Otherwise, directly cancel the GPRS service;
Switch unit is used for time-delay a period of time after described receiving device is being cancelled the GPRS service, opens the CSD Flow Control, finishes the switching of described receiving device to the CSD pattern.
6, equipment as claimed in claim 5 is characterized in that, also comprises:
Second judging unit is used to judge the link switchover that whether needs of receiving device.
7, equipment as claimed in claim 5 is characterized in that, also comprises:
The data call unit is used for when described receiving device is switching the data call sending ending equipment;
Detecting unit is used for detecting by CSD event call-back function the data call incident of receiving device, checks current transmission mode;
Described judgement control unit is used to also judge whether sending ending equipment GPRS is in connection status, if the GPRS pattern judges then whether GPRS is in connection status, connects if just disconnect GPRS, cancels the GPRS service then; Otherwise, directly cancel the GPRS service.
8, equipment according to claim 5 is characterized in that, wherein, described sending ending equipment and receiving device can be data transmission unit DTU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910018617A CN101674668A (en) | 2009-09-03 | 2009-09-03 | Equipment and method for switching links between GPRS and CSD |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910018617A CN101674668A (en) | 2009-09-03 | 2009-09-03 | Equipment and method for switching links between GPRS and CSD |
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| Publication Number | Publication Date |
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| CN101674668A true CN101674668A (en) | 2010-03-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910018617A Pending CN101674668A (en) | 2009-09-03 | 2009-09-03 | Equipment and method for switching links between GPRS and CSD |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107798846A (en) * | 2017-11-17 | 2018-03-13 | 杭州海兴电力科技股份有限公司 | Remote meter reading method and system based on CSD communications |
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| CN1509058A (en) * | 2002-12-18 | 2004-06-30 | 中国移动通信集团公司 | Method for accessing internet for wireless mobile communication apparatus |
| US20040133686A1 (en) * | 2000-07-07 | 2004-07-08 | Skog Robert Bengt | System and method for adapting information content according to the capability of the access bearer |
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| US20040133686A1 (en) * | 2000-07-07 | 2004-07-08 | Skog Robert Bengt | System and method for adapting information content according to the capability of the access bearer |
| CN1509058A (en) * | 2002-12-18 | 2004-06-30 | 中国移动通信集团公司 | Method for accessing internet for wireless mobile communication apparatus |
Non-Patent Citations (2)
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| 曹凡等: "基于GPRS 的IP 电话技术研究", 《通信技术》 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107798846A (en) * | 2017-11-17 | 2018-03-13 | 杭州海兴电力科技股份有限公司 | Remote meter reading method and system based on CSD communications |
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Inventor after: Hong Li Inventor after: Zhang Yang Inventor after: Chen Zhongqian Inventor after: Cai Liping Inventor before: Zhang Yang Inventor before: Hong Li Inventor before: Cai Liping Inventor before: Chen Zhongqian Inventor before: Cao Wensheng |
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Effective date of registration: 20100528 Address after: 257061 communication engineering department, School of computer and communication engineering, China University of Petroleum, 271 north two road, Shandong, Dongying Applicant after: China Petroleum University (East China) Co-applicant after: China University of Petroleum (East China) Address before: 257061 communication engineering department, School of computer and communication engineering, China University of Petroleum, 271 north two road, Shandong, Dongying Applicant before: China Petroleum University (East China) Co-applicant before: China University of Petroleum (East China) |
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